Apparatus for feeding material



April 23, 1935. w. D, FOSTER ET- AL APPARATUS FOR FEEDING MATERIAL FiledOct. 5, 1951 INVENTORS.

MERE/V flaw-MM F05 15R.

6mm; W

ATTORNEY.

Patented A as, teas PATT @FFHQE APPARATUS FUR FEEDENG MA'EIEREAL WarrenDunham Foster, Washington Township,

Bergen County, N. it, and Frederick Davenport Sweet, New York, N.

EL, assignors, by direct and mesne assignments, to Kinatome PatcutsQorporation, a corporation oi New York Application @ctoloer 5, 1931,Serial No. saute 26 illl The present invention relates broadly toimproved apparatus for feeding material and particularly to apparatusespecially adapted for the feeding of film bearing thereupon pictorialor sound images or for exposure to such images, al-

though the utility of the invention is not limited in this respect.

One purpose of this invention is to present improved apparatus forcarrying out the method of feeding described and claimed in thecopending application of Clarkson Ulysses Bundick and Barton AllenProctor, Serial Number 44,482, filed July 18, 1925., The Bundick andProctor system of feeding material, as described and claimed in theabove mentioned application, provides method and apparatus whereby astrip of material may be fed from one supporting member to another andan intermediate portion maintained motionless for regularly recurringperiods. In such system of feeding, both the delivery and the taking upcarriers are driven continuously but at rates of speed which vary inaccordance with the intermittency of movement of the intermediatesection of the material which is being worked upon, all of the materialbeing maintained under a condition of substantially uniform tension. Un-

der this system of feeding, the intermittently operable feeding memberdisposed between the masses of material serves both to draw materialdirectly from the source of supply and, working through the material, tooperate an auxiliary feeding and tensioning device disposedtherebetween. The driven taking-up member serves both to move the filmaway from this intermediate intermittently operating member and, alsoworking through the material, to operatean auxiliary feeding andtensioning 'device disposed therebetween.

An object of the present invention is to provide improved apparatus foruse with this system of feeding and improvements in the construction andarrangement of the auxiliary feeding and tensioning devices. Anotherobject is the provision of improved auxiliary feeding devices andimproved tensioning devices for use with material handling apparatus.

A further object is the provision of improved apparatus for controlling-the operation of an auxiliary feeding member or a tensioning member,preferably through the film itself.

In the accompanying drawing there is shown, for purposes of illustrationonly, one preferred embodiment of the present invention, together withtwo preferred modifications thereof, it being understood that thedrawing does not define the limits of the invention, as changes in theconstruction and operation disclosed therein may be madewithoutdeparting "from the spirit of the invention or the scope of thebroader claims.

In the drawing:

Figure 1 is a side diagrammatic elevational view illustrating oneembodiment of the present invention.

Figure 2 is a detailed view partly in section of the construction of theauxiliary feeding and tensioning unit of which use is made in thepresent invention. V

Figure 3 is a side elevational view of one preferred form of the presentinvention, and Figure 4 is a view taken on the lines t i of Figure 3looking in the direction of the arrows.'

Figure 5 is a view corresponding to Figure 2 showing a preferredmodification of the invention.

In carrying out the present invention in connection, for example, withthe feeding of film, there may be provided an apparatus including afeeding or delivery carrier 2 mounted for rotation upon a deliveryspindle 3 and a take-up carrier l mounted for rotation upon a spindle 5.Such carriers are shown as single magazines. Spindles 3 and 5 aremounted upon a main frame F of an apparatus which is diagrammaticallyindicated in Figure 1. Between these carriers is positioned a gategenerally indicated by 6 with an aperture at 1. A guiding roller 8 maybe provided at one end of such gate and a toothed feeding member 9 atthe other end thereof. Power to drive the feeding member 9 and thetake-up spindle 5 may be applied in any desired manner. Such applicationof power is well known and since it forms no part of the presentinvention, is not shown nor described.

Situated between the respective carriers and the feeding member 9 arevertical auxiliary feeding and tensioning units, which are shown indetail in Figure 2.

Each of these units preferably comprises a film engaging pad H mountedupon the rod or plunger l2, preferably non-circular in crosssection,which is positioned within the guiding structure l3. Coiled about therod I2 is a compression spring l4 normally urging the pad it toward thefilm f, such upward movement, as

viewed in the drawing, being limited by the pin I5, mounted in the lowerend of the rod l2 and engaging the lower end of the guiding structurel3. The upper and lower portions of such supporting structure may beformed with openings, indicated at I6 in Figure 2, of such shape,relative to the cross-section of the rod l2, as to prevent rotation ofthe rod.

The operation of the device is as follows:

As power is applied to the feeding member 9, it revolves and film ispulled from the carrier 2. The plunger I2 is depressed and energy isstored in the spring l4. While the feeding member 9 is at rest, thespring 14 moves the plunger l2 downwardly, as viewed in Figurel, wherebyan amount of film is pulled from the delivery carrier 2. Upon the nextrotation of .the feeding member 9, the portion of the film necessary tocompensate for the displacement caused thereby is the length of filmpreviously pulled from the carrier 2 and such as at that moment ispulled directly from such carrier. The resiliently mounted film-engagingpad serves to cushion this direct movement of film directly from thedelivery carrier.

It will be noted that the parts of our apparatus are so arranged thatthe film, when the film-engaging pads are depressed, tends to assume astraight line between the sprocket '9 and the take-up carrier andbetween the guiding idler 8 and the delivery carrier and that the filmengaging pads tend to work upon the film at substantially right anglesto its line of travel. This arrangement has several advantages, amongwhich is the quick response of the film and spring The operating of theauxiliary feeding and tensioning unit which is placed between theintermittent feeding member 9 and the take-up carrier 4 is analogous tothat of the corresponding unit associated with the delivery carrier. Asthe sprocket 9 revolves, a portion of the film equal to one frame ismoved forwardly. The resiliently mounted pad holds the film constantlyunder tension. The spindle 5, yieldingly but continuously driven, pullsthe film forwardly and coils it up upon the take-up reel 4. Thisoperation moves the supporting rod or plunger |2 against the pressure ofthe spring I 4. Thus there is stored therein an amount of energy whichis sufficient to, move the film away from the sprocket and to maintain,the tension upon the film f during the next period of rest of thesprocket 9. 'As the spindle 5 revolves during the period of rest of thesprocket 9, the direct pull upon the perforations of the film seatedupon the teeth of the sprocket is largely absorbed by I the cushioningeffect of the spring I4.

We have described this device as associated with an intermittentlydriven feeding. member. As will be readily understood by those skilledin the art, our invention may be advantageously applied to acontinuously driven feeding member for the purpose of securing an evenand steady flow of the material irrespective of minor variations in therate of movement of such member.

It is often desirable to move the film-engaging member of the feedingand tensioning unit away from the film so that space is provided for thethreading operation and to provide apparatus clearly shown in Figures 8and 4, we may provide a film-engaging pad 2| which is mounted upon orformed with the plate 22 which operates within the sleeve 23 formed inor attached to the main plate F. Extending downwardly, as viewed inFigure 3, from the film-engaging pad 2| is the rod 24, preferablynon-circular in cross-section, which passes through an opening ofsuitable contour in a right angled lower extension 25, as viewed inFigure 3, of the sleeve 23. A compression spring 26, coiled about therod 24 and extending between the lower extension 25 and thefilm-engaging pad 2|, tends to force the pad upwardly, the upwardmovement of the pad being limited by the engagement of a pin 21 insertedin the rod 24 with the lower extension 25 of the sleeve 23.

A latching device is provided to hold the pad 2| in its lower orinoperative position. A film-en gaging member 30 is mounted upon a lever3 I, rotatable upon a stud 32 and moved upwardly, as viewed in Figure 3,by a spring 33 extending between the stud and a pin 34. A dog 35extending from the lever 3| passes through a suitable opening in thesleeve 23 and at 36 engages a suitable notch in the plate 22.

At the conclusion of the operation of the device, in order easily toremove the film from the apparatus, the user pushes the pad 2| to theposition shown in full lines in Figure 3. When the film is next placedin operative position in the apparatus and the rotation of the take-upspindle 5 begun, the film will be pulled taut, and will move the member30 andthe lever 3| upon which it is mounted from the full line positionshown in Figure 3. to the dotted line position shown therein, thusreleasing the plate 22 from the holding influence of the dog 35 andplacing the tensioning device in full operation, as previouslydescribed.

If desired, instead of manually moving the pad 2| out of operativerelation with the film, it may be moved out of such relation by aconnection between the slide 22 and a controlmechanism interlocking suchslide with the other operable elements of the apparatus in the mannerdescribed and claimed in the co-pending application of Barton AllenProctor, Serial Number 54,910, filed September 8, 1925, or by aconnection between such slide and a movable gate section.

In Figure 5 we show a simple modification of our device. A film-engagingpad 4|, instead of being rigid as shown in Figures 2 and 3; is made froma fiat spring and attached to a plunger 42 as by spot welding. Thisplunger is maintained, as previously described, in the supportingstructure 43 and urged toward the film by a compression spring 44 whichis wound about the plunger 42, the upward movement of the plunger, asviewed in Figure 5, being limited by the pin 45. This resilientfilm-engaging surface performs a cushioning function in addition to thatperformed by the spring 44. Under the influence of the film as the filmis fed, it is moved from the full line position of Figure 5 to thatshown in the dotted line. The resilience of this spring 4| supplementsthat afforded by the coiled spring 44. Preferably, these springs areconstructed of different magnitudes, the spring 4| preferably performingthe cushioning function and the spring 44 the auxiliary feedingfunction.

In all forms of the invention thefilm-engaging pad may be formed with acentral portion relieved so that the image bearing portion of the filmdoes not come into contact with the pad.

Many of the advantages of the present invention have been stated aboveor will be obvious from a reading of the previous portion of thisspecification and the subjoined claims. Other advantages arise from theprovision of improved apparatus whereby a film or other material may befed from an idling delivery carrier to a driven take-up carrier by meansofan intermittent feeding member placed therebetween and auxiliaryfeeding and tensioning means operated by the film itself.

Still further advantages arise from the provision of an auxiliarytensioning and feeding device which secures a more even and steady flowof the material.

Another advantage of our invention arises from the provision of anauxiliary feeding and tensioning member which is placed into operativerelation with the film by the film itself, upon the initiation of thefeeding operation.

We claim:

1. In a film handling apparatus, an idling delivery carrier, acontinuously driven take-up car rier, an intermittently driven toothedfilm-feeding member positioned between said carriers for drawing filmfrom said delivery carrier and moving it toward said take-up carrier, amovable member engaging the film between said delivery carrier and saidfeeding member, a mounting for said film-engaging member which guidesthe movement thereof in a direction substantially right-angled to thefilm, said apparatus including spaced film engaging and guiding surfacesso placed in relation to said film engaging member that the film as itpasses over said film engaging member is not sufiiciently displaced froma straight line to subject'said film engaging member to substantialpressure in a direction angular to said right-angled direction of itsmovement, a spring urging said film-engaging member toward the film,said film-engaging member being so positioned relatively to said feedingmember and to said carrier that each feeding impulse of said feedingmember as it draws film directly from said delivery carrier is cushionedby said spring and also stores power in said spring, for moving the filmdirectly from said carrier during each period of idleness of saidfeeding member and for maintaining said carrier continuously inrotation, a movable member engaging the film between said feeding memberand said take-up carrier, a

mounting for said film engaging member which guides the movement thereofin a direction substantially right-angled to the film, said apparatusincluding spaced film engaging and guiding surfaces soplaced in relationto said film engaging member that the film as it passes over said filmengaging member is not sufficiently displaced said toothed intermittentfeeding member during the period of idleness of said intermittentfeeding member is cushioned by said film-engagingmember and power storedin said spring for moving the film away from said intermittent feedingmember during the period of operation of said intermittent member andfor maintaining the section of the film between said intermittentfeeding member and said take-up carrier continuously in motion.

2. In a film handling apparatus, an idling delivery carrier, anintermittently driven toothed member for drawing film directly from saidde livery carrier and a movable member engaging the film between saiddelivery carrier and said feeding member, a mounting for saidfilm-engaging member which guides the movement thereof in a direction"substantially right-angled to the film, said apparatus including spacedfilm engaging and guiding surfaces so placed in relation to said filmengaging member that the film as it passes over said film engagingmember is not sufficiently displaced from a straight line to subjectsaid film engaging member to substantial pressure in a direction angularto said right-angled direction of'i'ts movement, a spring'urging saidfilm-engaging member toward the film, said filmengaging member being sopositioned relatively to said feeding member and to said carrier and themagnitude of the spring being such that said film engagingmember-continuously maintains the section of the film therebetween undertension and that each feeding impulse of said feeding member as it drawsfilm directly from said delivery carrier is cushioned by said spring andalso stores power in said spring whereby said spring is effective tomove the film directly from said carrier during each period of idlenessof said feeding memberl.

3. In a film handling apparatus, a continuously driven take-up carrier,an intermittently driven toothed feeding member for moving film towardsaid take-up reel, ,a movable member engaging the film between saidfeeding member and said take-up carrier, a mounting for said filmengaging member which guides the movement thereof in a directionsubstantially right-angled to the film, said apparatus including spacedfilm engaging and guiding surfaces so placed in relation to said filmengaging member that the film.

urging said film-engaging member toward the film, said film-engagingmember being so positioned in relation to said take-up carrier and saidfeeding member and said spring being of such magnitude that the directpull of said continuously driven take-up carrier upon the film inengagement with said toothed intermittent feeding member during theperiod of idleness of said intermittent feeding member is cushioned bysaid film-engaging member and power stored in said spring, whereby saidfilm-engaging member during the period of operation of said intermittentmember moves the film away from said intermittent feeding member.

4. In a film handling apparatus, a delivery member, a take-up member, afeeding member positioned therebetween for drawing film from saiddelivery member and moving it toward said take-up member, said deliverymember being positioned in vertically and horizontally spaced relationto said feeding member, a guiding member engaging the film between saidfeeding member and said delivery member and so positioned in relation toeach of the same that the path of the film therebetween forms an angleat the apex of which said guiding member is disposed, said takeup memberbeing positioned in horizontally spaced relation to said feeding memberand at an angle to the path of the film between said feeding member andsaid guiding member, a first movable tensioning member engaging the filmbetween said guiding member and said delivery member, a mounting forsaid first tensioning member for guiding the same in a directionsubstantially right-angled to the line of the film as it extends betweensaid guiding member and said delivery member, a spring urging said firsttensioning member toward the film, a second movable tensioning memberengaging the film between said feeding member and said take-up member, amounting for said second tensioning member for guiding the same in adirection substantially right-angled to the line of the film as itextends between said guiding member and said delivery member, and aspring urging said second tensioning member toward thev film and inopposition to said spring associated with said first tensioning member.

5. Apparatus according to claim l, said guiding member being sopositioned that the angle formed thereby in the path of the film betweensaid delivery member and said feeding member is of the order of ninetydegrees and said take-up member being so positioned in relation to saidfeeding member that the angle formed by the path of the film betweensaid feeding member and said takeup member and the path of the filmbetween said guiding member and said feeding member is also of the orderof ninety degrees whereby said opposed spring loaded film engagingtensioning members move in line with each other.

6. In a film handling apparatus, two film supporting members, means forapplying power to one of said supporting members for feeding a film fromone of said members toward the other, a resiliently mountedreciprocating-plunger engaging the film between said supporting members,said members and said plunger being so disposed in relation to eachother that said resilient plunger and the feeding influence upon thefilm are alternatively effective without interference from film engagingelements intermediate said members to move the entire stretch of filmbetween said members between an arcuate position and one approaching thechord thereof whereby a relatively small degree of resilience applied tosaid plunger and a relatively small degree of excess power applied bysaid feeding means to the film are able quickly to affect the entirestretch of the film between said supporting members.

7. In a film handling apparatus, two film supporting members, means forapplying power to one of said supporting members for feeding a film fromone of said supporting members toward the other, a film-engagingtensioning element, a spring urging said element toward the film, and amounting for said element which guides the movement of said element in adirection substantially normal to the path of the film between saidsupporting members, said supporting members and said film engagingtensioning element being so disposed in relation to each other that saidelement and the feeding influence upon the film are alternativelyeffective without interference from film engaging members intermediatesaid supporting members to move the entire stretch of the film betweensaid supporting members between an arcuate position and one approachingthe chord thereof whereby a relatively small degree of tension in saidspring and consequently of excess power applied by said feeding means tothe film able affect said entire stretch. of

8. In a film handling apparatus, a toothed feeding member, a carrier,said carrier and said toothed feeding member being so disposed that afilm travels therebetween in approximately a straight line, and aresilient plunger an end of which engages the film between said toothedfeeding member and said carrier and is effective for displacing the filmfrom said straight line, said resilient plunger being so disposed inrelation to said toothed member and said carrier that its movement underthe influence of its resilience immediately affects the entire stretchof the film between said feeding member and said carrier, theright-angled relation of said plunger to said straight line preventingsaid plunger from binding because of decided angular pressure from thefilm as it travels over said end thereof.

9. In a film handling apparatus, a smooth roller and a carrier, saidcarrier and said roller being so disposed upon said apparatus that thefilm extends therebetween in a substantially straight line unhindered byengagement with an intermediate toothed member, means for feeding thefilm between said roller and said carrier, and a resilient plungerengaging the film in substantially rightangled relation to said straightline, the movement of said plunger due to its resilience being effectiveimmediately to condition the feeding of the stretch of the film betweensaid carrier and said roller.

10. In a film handling apparatus, a smooth roller and an idling carrier,said carrier and said roller being so disposed upon said apparatus thatthe film extends therebetween in a substantially straight lineunhindered by engagement with an intermediate toothed member, meansengaging the film upon the side of said smooth roller other than thatupon which said carrier is disposed for drawing the film over saidroller and from said car rier, and a resilient plunger engaging the filmin substantially right-angled relation to said straight line, themovement of said plunger due to its resilience being eifectiveimmediately to condition the feeding of the stretch of the film betweensaid carrier and said roller.

11. In a film handling apparatus, a toothed feeding member, a carrier,said carrier and said toothed feeding member being so disposed that filmtravels therebetween in approximately a straight line, means forapplying power to said carrier for winding up the film which is advancedthereto by said toothed feeding member, and a resilient plunger, an endof which engages the film between said toothed feeding member and saidcarrier and is effective for displacing the film from said straightline, said resilient plunger being so disposed in relation to saidtoothed member and said carrier that its movement under the influence ofits resilience immediately affects the entire stretch of the filmbetween said feeding member and said carrier, the right-angled relationof said plunger to'said straight line preventing said plunger frombinding because of decided angular pressure from the film as'it travelsover said end thereof.

12. In a film handling apparatus, two vertically spaced film carriers, amember engaging a film between said carriers for feeding it from one ofsaid carriers toward the other, said feeding member being verticallyspaced from one of said carriers and horizontally spaced from boththereof and so arranged that the portions of the film adjacent saidcarriers are mainly straight, and two opposed resiliently mountedreciprocating film tensioning pitmgers one engaging the relativelystraight line of the film between said feeding member and one of saidcarriers, and the other engaging the relatively straight line of thefilm between said feeding member and the other of said carriers, saidcarriers and said feeding memtoward the other, and two movable filmengaging tensioning elements, said apparatus including spaced filmengaging and guiding surfaces so disposed in relation to each ofsaidfilm engaging elements that the film as it passes over said filmengaging elements is so disposed that the line of the force to which itsubjects said film engaging elements is substantially coincidental withsaid right-angled direction of movement of said film engaging member,one of said elements being disposed between said feeding member and oneof said carriers and the other of said elements being disposed betweensaid feeding member and the other of said carriers, a mounting for eachof said elements so positioned that said elements are movable inopposition to 'each other and in directions substantially normal to thefilm, and springs for moving each of said elements toward the film.

14. In a film handling apparatus, a gate, a feeding member disposed uponone side thereof adjacent thereto for feeding a film therethrough, adelivery carrier for supporting the film so fed, said delivery carrierbeing disposed in horizontally spaced relation to one end of said gate,a take-up carrier for winding up film fed through said gate'by saidfeeding member, said take-up carrier being disposed in horizontallyspaced relation to said gate, two resiliently mounted reciprocating filmtensioning plungers one of which engages the straight line of the filmextending between said delivery carrier and the relatively adjacent endof said gate and the other of which engages the straight line of thefilm as it extends between said feeding member and said take up carrier,such arrangement of said plungers making them immediately effective uponsaid section of the film in opposition to each other.

15. In a film handling apparatus, a gate, a feeding member disposed uponone side thereof adjacent thereto for feeding a film therethrough, adelivery carrier for supporting the film-so fed, said delivery carrierbeing disposed in horizontally spaced relation to one end of said gateand so disposed in relation thereto that the line of the film extendingbetween said carrier and said gate makes an angle therewith of the orderof ninety degrees, a take-up carrier for winding up film fed throughsaid gate by said feeding memher, said take-up carrier being disposed inhorizontally spaced relation to said gate and so disposed in relationthereto that the line of the film extending between said carrier andsaid gate makes an angle therewith of the order of ninety degrees, andtwo resiliently mounted reciprocating film tensioning plungers one ofwhich engages the straight line of the film extending between saiddelivery carrier and the relatively adjacent end of said gate and theother of which engages the straight line of the film as it extendsbetween said feeding member and said take-up carrier,

such arrangement of said plungers making them immediately effective uponthe film in opposition 17. In a film handling apparatus, two filmsupporting members, means for feeding a. film from one of said membersto the other, a film tensioning element engaging the film between-saidsupporting'members, a rod on which said element is mounted, a housingabout said rod, a spring within said housing and operatively connectedthereto and to saidelement for urging said element toward the film, andmeans for mounting said rod within said housing, said mounting meanspreventing a turning movement of said rod within said housing.

18. In a film handling apparatus, two film supporting members, means forfeeding a film from one of said members to the other, a film tensioningelement engaging the film between said supporting members, a spring forurging said film engaging element toward the film, a spring within saidhousing and operatively attached to said film engaging element, andmeans for mounting said film engaging element for reciprocating movementunder the influence of said spring.

19. In a film handling apparatus, two film supporting members, means forfeeding a film from one of said members to the other, a film tensioningmember engaging the film between said supporting members, a plunger uponwhich said film engaging member is mounted, a housing for said plunger,and resilient means within said plunger whereby said' film engagingmember may be moved relatively to the film.

20. In a film handling apparatus, two film supporting members, means forfeeding a film from one of said members to the other, a member enbers, aslide upon which said film engaging memher is 'mounted,' a sleeve forguiding said slide so that said film engaging member may movereciprocatingly in relationto the film, a spring urging said slidetoward the film, a latch for holding said slide away from the film sothat said film engaging member is disposed instantly from the path ofthe film so that the film may be conveniently threaded, and a releasefor said latch, said release including an actuating member which extendsinto the path in which the film is threaded whereby after the film hasbeen threaded the tension thereof releases said latch so that said slideunder the influence of said spring moves said film engaging member intooperative relation to bers, a spring for moving said tension controllingmember into operative relation with the film, and a latch for holdingsaid member against the power of said spring out of such operativerelation with the film whereby the film may be conveniently threaded insaid apparatus.

22. In a film handling apparatus, two film supporting members, means forfeeding a film of one of said members toward the other, a filmtensioning member, and control means for said film tensioning member,said control means including means for maintaining said film engagingmember in a first or threading position wherein said film engagingmember is out of operative relation with the film audits path so thatthe threading operation can be conveniently carried out and a second oroperating position wherein said tensioning member is disposed inoperative contact with the film, means for dis? abling said maintainingmeans, and a spring "which is effective upon the disabling ofsaidmaintaining means both for moving said film engaging member fromsaid first or threading position into said second or operating positionand for thereafter operating said film engaging memher while in saidoperating position.

23. In a film handling apparatus, two film supporting members, means forfeeding a film from one of said members toward the other, a member forcontrolling the tension of that section of the film that extends betweensaid supporting members, a spring for moving said member into operativerelation with the film, a latch for holding said member against theppwer of said spring out of such operative relation with the film, and acontrol member operated by the film for relea'sing said latch when thetension upon the film exceeds a predetermined point.

24. In a film handling apparatus, two film supporting members, means forfeeding a film from one of said members toward the other, means forcontrolling the tension of that section of the film which extendsbetween said supporting members, said means including a film engagingelement, a member by which said element is carried, resilient meansurging s aid carrying member toward the film, a mounting for saidcarrying member which guides said carrying member in a movement normalto the direction of travel of the film between said supporting members,a latch for holding said carrying member against the action of saidresilient means, and means controlled by the film for releasing saidlatch.

25. In a film handling apparatus, two film supporting members in linewith each other, means for feeding a film from one of said memberstoward the other, a member engaging the film between said supportingmembers, a spring for moving said engaging member from one positionwherein the film is disposed in a relatively direct path between saidsupporting members to another position wherein it disposes the film in arelatively long path between said supporting members, a latch for saidspring, and means controlled by the film for releasing said latch.

26. In a film handling apparatus, two film supporting members, means forfeeding a film from one of said members toward the other, a fiattensioning spring engaging the film between said I WARREN DUNHAM FOSTER.FREDERICK DAVENPORT SWEET.

